From aba1cc152167e44af0404c14391b093898b09b5f Mon Sep 17 00:00:00 2001
From: Andrew Jacobs <andrew.jacobs@btinternet.com>
Date: Fri, 22 Mar 2019 13:25:48 +0000
Subject: [PATCH] Fixed carry generation in CMP, CPX and CPY

---
 emu816.h | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/emu816.h b/emu816.h
index bcc568c..26ea273 100644
--- a/emu816.h
+++ b/emu816.h
@@ -769,7 +769,7 @@ private:
 
 		if (e || p.f_m) {
 			Byte	data = getByte(ea);
-			Word	temp = data - a.b;
+			Word	temp = data - a.b - 1;
 
 			setc(temp & 0x100);
 			setnz_b(lo(temp));
@@ -777,7 +777,7 @@ private:
 		}
 		else {
 			Word	data = getWord(ea);
-			Addr	temp = data - a.w;
+			Addr	temp = data - a.w - 1;
 
 			setc(temp & 0x10000L);
 			setnz_w((Word)temp);
@@ -820,7 +820,7 @@ private:
 
 		if (e || p.f_x) {
 			Byte	data = getByte(ea);
-			Word	temp = data - x.b;
+			Word	temp = data - x.b - 1;
 
 			setc(temp & 0x100);
 			setnz_b(lo(temp));
@@ -828,7 +828,7 @@ private:
 		}
 		else {
 			Word	data = getWord(ea);
-			Addr	temp = data - x.w;
+			Addr	temp = data - x.w - 1;
 
 			setc(temp & 0x10000);
 			setnz_w((Word) temp);
@@ -842,7 +842,7 @@ private:
 
 		if (e || p.f_x) {
 			Byte	data = getByte(ea);
-			Word	temp = data - y.b;
+			Word	temp = data - y.b - 1;
 
 			setc(temp & 0x100);
 			setnz_b(lo(temp));
@@ -850,7 +850,7 @@ private:
 		}
 		else {
 			Word	data = getWord(ea);
-			Addr	temp = data - y.w;
+			Addr	temp = data - y.w - 1;
 
 			setc(temp & 0x10000);
 			setnz_w((Word) temp);